Sectionalized piston-head



A. W. WALL.

SECTIONALIZED PISTON HEAD.

APPLICATION man 050.27, 1918.

Patented NOV; 16, 1920.

- to the UNITED STATES PATENT OFFICE.

snc'rroimmznn PISTON-'I-IEAD.

Application filed December 27, 1918.

To all who met may concern:

Be it known that I, ARTHUR WILLIAM W'ALL, a subject of the Kingdom of Great Britain, residing at The Laurels, Lyndon End, Sheldon, near Birmingham, in the county of Warwick, England, have invented certain new and useful Improvements in or Relating to Sectionalized Piston-Heads and Manufacture of the Same, of which the following is a specification.

This invention, which comprises certain improvements in or relating to pistons suitable for internal-combustion engines, and to the manufacture of the same, has for its purpose to provide a light, strong, and eflicient piston which is cheap to manufacture,- and consists of a piston comprising or involving two frame members divided axially of the piston. Suitable opposing chambers are stamped, pressed, or the like in these frame members, in which the pivotal connection between the piston and the connecting rod is located. The said frame members may be encircled by a cylindrical skirt, particularly in the case of a two-stroke engine, and said frame members are advantageously manufactured by stamping, pressing, or equivalently working the sheet metal of which they are composed.

In order that this invention may be clearly understood and readily carried into practice, reference may be had to the appended explanatory sheet of drawings, upon which igure 1 is a sectional elevation of a piston constructed according to the present invention.

Fig. 2 is a sectional elevation of the piston shown in Fig. 1. the plane of section being on line 1-2 of the figure last mentioned.

Fig. 3 is a sectional plan of the piston shown in Figs. 1 and 2. the plane of section being on line 3-4 of Fig. 1

Fig. 4 is a view similar to Fig. 1, but illustrating a modified e bodiment of the present invention.

According to the present invention, the piston comprises or involves two frame stampings a, a, each having a web extending diametrically and axially of the piston. Each stamping has at one extremity a semicircular flange b at right angles; when the stampings are placed with the webs a, a in contact with each other, the flanges b, 5 present a circular disk-like part. A plate 0 is adapted to be secured to the flanges b, b, said plate constituting the top or face of the Specification of Letters Patent.

Patented Nov. 16, 1920. Serial No. 268,548.

piston, and in the said plate a projection or other suitable formation (Z may be formed y stamping, pressing, or equivalent process to direct the gases in a two-stroke engine. A cylinder or tubulus c encircles the stampings first mentioned and constitutes the skirt of the piston. This cylinder or tubulus is retained in relation to the end plate of the piston advantageously by bending or working the metal of the two frame stampings a a over or in relation to said tubulus. The stampings a a may at their extremities remote from the working faceof the piston be provided with semi-circular flanges 7 which may diverge in a direction away from the piston face.

At each extremity the cylinder constituting the skirt of the piston may be formed with an annular stop 9 9, this provides a recess for a piston ring it. The edges of the divergent flanges of the two frame stampings may be formed with teeth, tongues, or the like 2' which may be readily bent over the extremity'of the tubular skirt, thereby retaining the latter as well as the piston rings in position. The face plate of the piston may be secured to the adjacent flanges oi the frame stampings by welding, or the l' e.

In the diametric webs of the frame stampings cylindrical chambers 7' may be pressed or worked; the said cylindrical chambers are adapted to be opposed to each other to form a cylindrical cavity located with its axis at right angles to the axis of the piston in which the pivotal connection between the piston and the connecting rod may be located. This cylindrical cavity may form a female bearing surface, for the extremity of a connecting rod such as is described in my prior application Serial No. 268,545, December 27, 1918. This prior application describes a connecting rod composed of two stampings each having bosses pressed therefrom, which bosses when the stampings are aggregated together, are alined to form at each end of the connecting rod a drum-like member located transversely to the length of the connecting rod. k represent depressions which are formed in the diametric webs to accommodate the connecting rod shank in its oscillatory movements.

In the case of a four-stroke engine, the skirt 6 is not essential. Fig. 4 illustrates an embodiment of the invention in which this is omitted, and in which a a represent the contacting in an axial plane of the piston Witnesses:

semi-circular frame stampings. In order to ton, a disk secured to said end flanges conincorporate the piston rings 72, end plates stituting the Working face of the piston, and 0 0 are applied, said end plates each being a cylindrical skirt encircling said plates and annularly stepped so that they form With engaging theend flanges thereof, said skirt the members a annular grooves for the pisbeing retained in relation to said disk by ton rings 79. An aperture 0 is provided in bending the metal of which the plates are the lower plate '0 to accommodate the concomposed in relation to said skirt.

necting rod. A piston suitable for an internal com- What I claim as my invention and desire bustion engine, comprising frame portions 7 to secure by Letters Patent is provided With tubular formations for the 1. A piston suitable for an internal comconnecting rod pivot, said froine portions be bustion engine, comprising a pair of plates ing divided longitudinally of the piston and contacting in an axial plane of the piston transversely to the axes of said tubular for and formed with end flanges respect vely inations and adapted inwardly to abut in a constituting the bottom and top of the pismanner such that the said tubular formaton, and a cylindrical skirt encircling the tions are thereby alined.

plates engaging the end flanges thereof. In Witness whereof I have hereunto set '2. A piston suitable-for an internal own my hand in the presence of two Witnesses. bustion engine, comprising a pair of plates ARTHUR WILLIAM ALL.

and formed Wltll'BIld. flanges respectively ARTHUR H. BROWN,

constituting the top and bottom of the pis- EDGAR N. WHEELER. 

